CN106583466A - Rolled steel hot delivery and hot charging technology - Google Patents

Rolled steel hot delivery and hot charging technology Download PDF

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Publication number
CN106583466A
CN106583466A CN201611155968.7A CN201611155968A CN106583466A CN 106583466 A CN106583466 A CN 106583466A CN 201611155968 A CN201611155968 A CN 201611155968A CN 106583466 A CN106583466 A CN 106583466A
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CN
China
Prior art keywords
hot
slab
rolling
hot charging
steel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201611155968.7A
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Chinese (zh)
Inventor
罗新生
林世文
李峨永
罗清明
毛晓斌
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan Desheng Group Vanadium Titanium Co Ltd
Original Assignee
Sichuan Desheng Group Vanadium Titanium Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sichuan Desheng Group Vanadium Titanium Co Ltd filed Critical Sichuan Desheng Group Vanadium Titanium Co Ltd
Priority to CN201611155968.7A priority Critical patent/CN106583466A/en
Publication of CN106583466A publication Critical patent/CN106583466A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/22Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
    • B21B1/222Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a rolling-drawing process; in a multi-pass mill
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B37/00Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/74Temperature control, e.g. by cooling or heating the rolls or the product
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0203Cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B45/00Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
    • B21B45/02Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
    • B21B45/0269Cleaning
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00Continuous casting of metals, i.e. casting in indefinite lengths

Abstract

The invention discloses a rolled steel hot delivery and hot charging technology which comprises the steps of rotary furnace treatment, continuous casting, cutting, hot delivery, hot charging, heating and rolling. Molten steel coming out of a rotary furnace is cast into a plate blank, the casting superheat degree is 12-15 degrees, and a pulling rate is controlled at 0.8-1.0m/min; after the plate blank is subjected to on-line length-fixing cutting, the plate blank is directly sent to a heating furnace via a hot delivery roller way, the temperature of the hot delivery roller way is controlled at 600-800 degrees, and after the plate blank passes through the heating furnace, the plate blank is rolled. With the adoption of the rolled steel hot delivery and hot charging technology, a yield and a finished product rate of molten steel can be raised, the production efficiency can be improved, the strength and toughness of rolled steel can be improved, and the product quality can be ensured.

Description

A kind of steel rolling Process of Hot Transfering And Hot Charging
Technical field
The present invention relates to technical field of steel production, and in particular to a kind of steel rolling Process of Hot Transfering And Hot Charging.
Background technology
Hot charging and hot rolling of continuous casting slab, refers in process of production, the qualified slab of high temperature is directly sent to into heating stove heat laggard Row " is rolled while hot ", with less energy consumption, profitable significant advantage.Hot Delivery and Hot Charging of Continuous Casting Slab in the end of the sixties in last century by The U.S. proposes that the beginning of the seventies in last century is carried out in Japan and develops quickly, and therewith in Europe, some countries promote, and China is Start formal application at the beginning of the nineties in last century.Energy saving, raising heating furnace output, quickening rolling rhythm, raising steel rolling Production efficiency, reduction slab scaling loss, shortening material flow and reduction storage base space etc. are all the advantages of the technology, and it is still in fact Existing Technology Progress, energy-saving and emission-reduction, the direct measure of cost efficiency.For large iron and steel enterprise, hot charging and hot rolling of continuous casting slab skill The level of application of art becomes the new technique index for weighing its production technology.However, existing hot delivery and hot charging technology still has one A little defects, such as molten steel recovery rate and lumber recovery is relatively low, and hardness is relatively low and uneven, and sheet billet continuous casting, hot rolling are difficult, and defect is high, table More than facial cleft stricture of vagina etc..
The content of the invention
In view of this, the application provides a kind of steel rolling Process of Hot Transfering And Hot Charging, it is possible to increase molten steel recovery rate and lumber recovery, carries High efficiency, improves steel rolling intensity and toughness, it is ensured that product quality.
For solve above technical problem, the present invention provide technical scheme be a kind of steel rolling Process of Hot Transfering And Hot Charging, including turn Stove, continuous casting, cutting, heat give, hot charging, heating, milling step, from converter pouring molten steel out into slab, the cast degree of superheat is 12-15 DEG C, casting speed control is in 0.8-1.0m/min;Slab Jing heat after online Length-fixing cutting send roller-way to be fed directly to heating Stove, heat send roller-way temperature control at 600-800 DEG C, and slab sends into rolling after heating furnace.
Preferably, in the heating furnace, bringing-up section furnace temperature is 1150-1300 DEG C, and air coefficient is 1.0-1.1;Soaking zone Furnace temperature is 1150-1200 DEG C, and air coefficient is 0.8-0.9.
Preferably, slab time of staying in heating furnace is 2.0-2.5h, and the tapping temperature of slab is 1150-1200 ℃。
Preferably, using two frame roughing and four frame finish rolling, rough rolling step is rolled the slab using four-pass, finish rolling Stage adopts six passes.
It is more highly preferred to, the roughing finishing temperature is 1150-1180 DEG C, the finish rolling finishing temperature is 900-950 DEG C.
Preferably, the slab clears up surface after rolling using water under high pressure, and the operating pressure of water under high pressure is not less than 155MPa。
It is more highly preferred to, rapid cooling after the rolling, using front end laminar flow refrigerating mode, rate of cooling is 12-14 DEG C/s, under It is air-cooled to less than 90 DEG C after line.
Preferably, from converter pouring molten steel out into slab, the cast degree of superheat is 13-14 DEG C, and casting speed control is in 0.9m/ min。
Preferably, the heat send roller-way temperature control at 750 DEG C.
The Process of Hot Transfering And Hot Charging of steel rolling described in technical scheme include converter, continuous casting, cutting, heat give, hot charging, plus Heat, milling step, from converter pouring molten steel out into slab, slab Jing heat after online Length-fixing cutting send roller-way direct Heating furnace is delivered to, slab sends into rolling after heating furnace.Wherein control the drawing in the degree of superheat and casting process of slab cast Speed, its pulling rate and the degree of superheat are matched, it is possible to increase while molten steel recovery rate and lumber recovery, improve production efficiency;Slab is passed through Direct hot delivery and hot charging enters heating furnace after line Length-fixing cutting, and without the need for carrying out slow cooling or annealing, steel slab avoids heating of plate blank When crackle appearance so as to heating quality meet rolling requirement;After slab rolling, using high pressure water process, be conducive to removing The iron scale on steel rolling surface, improves surface quality;Quickly cool down after rolling, it is to avoid large scale particle is separated out to toughness in steel rolling Infringement.
Compared with prior art, steel rolling Process of Hot Transfering And Hot Charging described herein, it is possible to increase molten steel recovery rate and become a useful person Rate, improve production efficiency improves steel rolling intensity and toughness, it is ensured that product quality.
Specific embodiment
In order that those skilled in the art more fully understands technical scheme, with reference to specific embodiment pair The present invention is described in further detail.
Embodiment 1
A kind of steel rolling Process of Hot Transfering And Hot Charging described in the present embodiment, including converter, continuous casting, cutting, heat give, hot charging, heating, Milling step, from converter pouring molten steel out into slab, the cast degree of superheat is 14 DEG C, and casting speed control is in 0.9m/min;Slab Jing heat send roller-way to be fed directly to heating furnace after online Length-fixing cutting, and heat send roller-way temperature control at 700 DEG C, the heating In stove, bringing-up section furnace temperature is 1200 DEG C, and air coefficient is 1.0;Soaking zone furnace temperature is 1180 DEG C, and air coefficient is 0.9, and slab exists The time of staying is 2.0h in heating furnace, and the tapping temperature of slab is 1180 DEG C, and slab sends into rolling after heating furnace, described Slab is rolled using two frame roughing and four frame finish rolling, rough rolling step using four-pass, and the finish rolling stage adopts six passes, The roughing finishing temperature be 1170 DEG C, the finish rolling finishing temperature be 920 DEG C, the slab after rolling, using water under high pressure Cleaning surface, the operating pressure of water under high pressure is not less than 155MPa, rapid cooling after rolling, using front end laminar flow refrigerating mode, cooling speed Spend for 13 DEG C/s, it is offline after it is air-cooled to less than 90 DEG C.
In the present embodiment, finished product steel rolling plate property testing result is:Thickness is that the steel plate average hardness of 20mm is 400HB, yield strength is 1250MPa, and tensile strength is 1300MPa, and elongation percentage is 9.8%.
Embodiment 2
A kind of steel rolling Process of Hot Transfering And Hot Charging described in the present embodiment, including converter, continuous casting, cutting, heat give, hot charging, heating, Milling step, from converter pouring molten steel out into slab, the cast degree of superheat is 12 DEG C, and casting speed control is in 0.8m/min;Slab Jing heat send roller-way to be fed directly to heating furnace after online Length-fixing cutting, and heat send roller-way temperature control at 600 DEG C, the heating In stove, bringing-up section furnace temperature is 1150 DEG C, and air coefficient is 1.0;Soaking zone furnace temperature is 1150 DEG C, and air coefficient is 0.8, and slab exists The time of staying is 2.0h in heating furnace, and the tapping temperature of slab is 1150 DEG C, and slab sends into rolling after heating furnace, described Slab is rolled using two frame roughing and four frame finish rolling, rough rolling step using four-pass, and the finish rolling stage adopts six passes, The roughing finishing temperature be 1150 DEG C, the finish rolling finishing temperature be 900 DEG C, the slab after rolling, using water under high pressure Cleaning surface, the operating pressure of water under high pressure is not less than 155MPa, rapid cooling after rolling, using front end laminar flow refrigerating mode, cooling speed Spend for 12 DEG C/s, it is offline after it is air-cooled to less than 90 DEG C.
In the present embodiment, finished product steel rolling plate property testing result is:Thickness is that the steel plate average hardness of 20mm is 398HB, yield strength is 1230MPa, and tensile strength is 1311MPa, and elongation percentage is 10.0%.
Embodiment 3
A kind of steel rolling Process of Hot Transfering And Hot Charging described in the present embodiment, including converter, continuous casting, cutting, heat give, hot charging, heating, Milling step, from converter pouring molten steel out into slab, the cast degree of superheat is 15 DEG C, and casting speed control is in 1.0m/min;Slab Jing heat send roller-way to be fed directly to heating furnace after online Length-fixing cutting, and heat send roller-way temperature control at 800 DEG C, the heating In stove, bringing-up section furnace temperature is 1300 DEG C, and air coefficient is 1.1;Soaking zone furnace temperature is 1200 DEG C, and air coefficient is 0.9, and slab exists The time of staying is 2.5h in heating furnace, and the tapping temperature of slab is 1200 DEG C, and slab sends into rolling after heating furnace, described Slab is rolled using two frame roughing and four frame finish rolling, rough rolling step using four-pass, and the finish rolling stage adopts six passes, The roughing finishing temperature be 1180 DEG C, the finish rolling finishing temperature be 950 DEG C, the slab after rolling, using water under high pressure Cleaning surface, the operating pressure of water under high pressure is not less than 155MPa, rapid cooling after rolling, using front end laminar flow refrigerating mode, cooling speed Spend for 14 DEG C/s, it is offline after it is air-cooled to less than 90 DEG C.
In the present embodiment, finished product steel rolling plate property testing result is:Thickness is that the steel plate average hardness of 20mm is 400HB, yield strength is 1240MPa, and tensile strength is 1320MPa, and elongation percentage is 10.2%.
Embodiment 4
A kind of steel rolling Process of Hot Transfering And Hot Charging described in the present embodiment, including converter, continuous casting, cutting, heat give, hot charging, heating, Milling step, from converter pouring molten steel out into slab, the cast degree of superheat is 15 DEG C, and casting speed control is in 1.0m/min;Slab Jing heat send roller-way to be fed directly to heating furnace after online Length-fixing cutting, and heat send roller-way temperature control at 800 DEG C, the heating In stove, bringing-up section furnace temperature is 1150 DEG C, and air coefficient is 1.0;Soaking zone furnace temperature is 1200 DEG C, and air coefficient is 0.9, and slab exists The time of staying is 2.5h in heating furnace, and the tapping temperature of slab is 1200 DEG C, and slab sends into rolling after heating furnace, described Slab is rolled using two frame roughing and four frame finish rolling, rough rolling step using four-pass, and the finish rolling stage adopts six passes, The roughing finishing temperature be 1150 DEG C, the finish rolling finishing temperature be 900 DEG C, the slab after rolling, using water under high pressure Cleaning surface, the operating pressure of water under high pressure is not less than 155MPa, rapid cooling after rolling, using front end laminar flow refrigerating mode, cooling speed Spend for 12 DEG C/s, it is offline after it is air-cooled to less than 90 DEG C.
In the present embodiment, finished product steel rolling plate property testing result is:Thickness is that the steel plate average hardness of 20mm is 402HB, yield strength is 1209MPa, and tensile strength is 1360MPa, and elongation percentage is 10.0%.
Embodiment 5
A kind of steel rolling Process of Hot Transfering And Hot Charging described in the present embodiment, including converter, continuous casting, cutting, heat give, hot charging, heating, Milling step, from converter pouring molten steel out into slab, the cast degree of superheat is 12 DEG C, and casting speed control is in 1.0m/min;Slab Jing heat send roller-way to be fed directly to heating furnace after online Length-fixing cutting, and heat send roller-way temperature control at 800 DEG C, the heating In stove, bringing-up section furnace temperature is 1150 DEG C, and air coefficient is 1.1;Soaking zone furnace temperature is 1150 DEG C, and air coefficient is 0.9, and slab exists The time of staying is 2.5h in heating furnace, and the tapping temperature of slab is 1200 DEG C, and slab sends into rolling after heating furnace, described Slab is rolled using two frame roughing and four frame finish rolling, rough rolling step using four-pass, and the finish rolling stage adopts six passes, The roughing finishing temperature be 1150 DEG C, the finish rolling finishing temperature be 950 DEG C, the slab after rolling, using water under high pressure Cleaning surface, the operating pressure of water under high pressure is not less than 155MPa, rapid cooling after rolling, using front end laminar flow refrigerating mode, cooling speed Spend for 13 DEG C/s, it is offline after it is air-cooled to less than 90 DEG C.
In the present embodiment, finished product steel rolling plate property testing result is:Thickness is that the steel plate average hardness of 20mm is 415HB, yield strength is 1252MPa, and tensile strength is 1314MPa, and elongation percentage is 10.5%.
Embodiment 6
A kind of steel rolling Process of Hot Transfering And Hot Charging described in the present embodiment, including converter, continuous casting, cutting, heat give, hot charging, heating, Milling step, from converter pouring molten steel out into slab, the cast degree of superheat is 13 DEG C, and casting speed control is in 1.0m/min;Slab Jing heat send roller-way to be fed directly to heating furnace after online Length-fixing cutting, and heat send roller-way temperature control at 800 DEG C, the heating In stove, bringing-up section furnace temperature is 1300 DEG C, and air coefficient is 1.1;Soaking zone furnace temperature is 1200 DEG C, and air coefficient is 0.9, and slab exists The time of staying is 2.5h in heating furnace, and the tapping temperature of slab is 1150 DEG C, and slab sends into rolling after heating furnace, described Slab is rolled using two frame roughing and four frame finish rolling, rough rolling step using four-pass, and the finish rolling stage adopts six passes, The roughing finishing temperature be 1180 DEG C, the finish rolling finishing temperature be 900 DEG C, the slab after rolling, using water under high pressure Cleaning surface, the operating pressure of water under high pressure is not less than 155MPa, rapid cooling after rolling, using front end laminar flow refrigerating mode, cooling speed Spend for 14 DEG C/s, it is offline after it is air-cooled to less than 90 DEG C.
In the present embodiment, finished product steel rolling plate property testing result is:Thickness is that the steel plate average hardness of 20mm is 400HB, yield strength is 1230MPa, and tensile strength is 1325MPa, and elongation percentage is 9.98%.
The above is only the preferred embodiment of the present invention, it is noted that it is right that above-mentioned preferred implementation is not construed as The restriction of the present invention, protection scope of the present invention should be defined by claim limited range.For the art For those of ordinary skill, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, these change Enter and retouch also to should be regarded as protection scope of the present invention.

Claims (9)

1. a kind of steel rolling Process of Hot Transfering And Hot Charging, including converter, continuous casting, cutting, heat give, hot charging, heating, milling step, its feature It is:From converter pouring molten steel out into slab, the cast degree of superheat is 12-15 DEG C, and casting speed control is in 0.8-1.0m/min;Plate Base Jing heat after online Length-fixing cutting send roller-way to be fed directly to heating furnace, and heat send roller-way temperature control at 600-800 DEG C, plate Base sends into rolling after heating furnace.
2. a kind of steel rolling Process of Hot Transfering And Hot Charging according to claim 1, it is characterised in that:In the heating furnace, bringing-up section Furnace temperature is 1150-1300 DEG C, and air coefficient is 1.0-1.1;Soaking zone furnace temperature is 1150-1200 DEG C, and air coefficient is 0.8- 0.9。
3. a kind of steel rolling Process of Hot Transfering And Hot Charging according to claim 1, it is characterised in that:The slab stops in heating furnace The time is stayed to be 2.0-2.5h, the tapping temperature of slab is 1150-1200 DEG C.
4. a kind of steel rolling Process of Hot Transfering And Hot Charging according to claim 1, it is characterised in that:The slab is thick using two frames Roll and four frame finish rolling, rough rolling step is rolled using four-pass, the finish rolling stage adopts six passes.
5. a kind of steel rolling Process of Hot Transfering And Hot Charging according to claim 4, it is characterised in that:The roughing finishing temperature is 1150-1180 DEG C, the finish rolling finishing temperature is 900-950 DEG C.
6. a kind of steel rolling Process of Hot Transfering And Hot Charging according to claim 1, it is characterised in that:The slab is adopted after rolling Surface is cleared up with water under high pressure, the operating pressure of water under high pressure is not less than 155MPa.
7. a kind of steel rolling Process of Hot Transfering And Hot Charging according to claim 1, it is characterised in that:Rapid cooling after the rolling, adopts Front end laminar flow refrigerating mode, rate of cooling is 12-14 DEG C/s, offline rear air-cooled to less than 90 DEG C.
8. a kind of steel rolling Process of Hot Transfering And Hot Charging according to claim 1, it is characterised in that:From converter pouring molten steel out Into slab, the cast degree of superheat is 13-14 DEG C, and casting speed control is in 0.9m/min.
9. a kind of steel rolling Process of Hot Transfering And Hot Charging according to claim 1, it is characterised in that:The heat send roller-way temperature control At 750 DEG C.
CN201611155968.7A 2016-12-14 2016-12-14 Rolled steel hot delivery and hot charging technology Pending CN106583466A (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN110102729A (en) * 2019-05-24 2019-08-09 山东钢铁股份有限公司 A kind of quick hot sending device and hot sending method of continuous casting high alloy die steel round billet
CN110639952A (en) * 2018-10-17 2020-01-03 广东韶钢松山股份有限公司 Hot conveying method for medium plate blank
CN111069553A (en) * 2019-12-16 2020-04-28 武汉科技大学 Quality improvement method of continuous casting billet
CN111420989A (en) * 2020-03-31 2020-07-17 湖南华菱湘潭钢铁有限公司 Method and system for producing medium-thickness steel plate

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CN111420989A (en) * 2020-03-31 2020-07-17 湖南华菱湘潭钢铁有限公司 Method and system for producing medium-thickness steel plate

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